On December 29, 1890, American troops opened fire with howitzers on hundreds of unarmed Lakota Sioux men, women, and children near Wounded Knee Creek in South Dakota, killing nearly 300 Sioux. As acclaimed historian Heather Cox Richardson shows in Wounded Knee, the massacre grew out of a set of political forces all too familiar to us today: fierce partisanship, heated political rhetoric, and an irresponsible, profit-driven media.